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通过热解蔗糖/Al2O3前驱体的方法制备了炭包覆改性Al2O3(CCA)载体,并采用等体积浸渍制备了负载量17%的镍基催化剂.对载体及相应催化剂进行了TPO-MS、N2物理吸附、TPR、XRD等测试表征,并考察了催化剂顺酐(MA)加氢合成γ-丁内酯(GBL)的反应性能.结果表明,适量炭的引入改变了载体Al2O3的表面性质,使金属-载体相互作用减弱,活性组分镍的分散度提高,催化剂在MA加氢反应中表现出高的GBL选择性.当Al2O3中引入8.9%的炭时,催化剂表现出最高的催化活性,在210℃,5 MPa氢气压力下反应3 h时,MA转化率达98%以上,GBL选择性达91.71%.
A carbon-coated Al2O3 (CCA) support was prepared by pyrolysis of sucrose / Al2O3 precursor and a 17% loading of Ni-based catalyst was prepared by impregnation with an equal volume of impregnation.The TPO-MS, N2 physical adsorption, TPR and XRD were used to characterize the catalytic performance of the catalysts for the synthesis of γ-butyrolactone (GBL) by hydrogenation of maleic anhydride (MAA) .The results showed that the introduction of a proper amount of carbon changed the surface properties of the support Al2O3, The interaction between metal and support was weakened and the dispersibility of nickel as active component was improved.The catalyst exhibited high GBL selectivity in MA hydrogenation reaction.When 8.9% carbon was introduced into Al2O3, the catalyst showed the highest catalytic activity, When the reaction was carried out at 210 ℃ and 5 MPa hydrogen pressure for 3 h, the conversion of MA was over 98% and the selectivity to GBL was 91.71%.